Pick fast, cool-season Asian greens: mizuna, tatsoi, komatsuna, mustard greens and baby bok choy. Sow them in fall first and early spring second. Napa cabbage is a fall-only gamble, and summer belongs to heat-lovers such as amaranth. Arkansas has a long, hot, humid summer squeezed between two short cool stretches, and the right variety is the one that finishes inside one of them.
The short answer for Arkansas
Choose by type. Quick leafy greens (mizuna, tatsoi, komatsuna, mustard greens, loose pak choi) are the dependable core of the garden. Full-size bok choy and napa cabbage are fall crops. Amaranth, sold as yin choy or Chinese spinach, fills the summer gap when everything else bolts.
The freeze dates explain why. At the Little Rock reference station, the last spring freeze at 32°F falls between March 12 and March 28, and the first fall freeze between November 7 and November 20. Those dates come from the 30 to 70 percent probability band for a 32°F night in the NOAA 1991-2020 Climate Normals. They are odds of a freeze on a given date, and no date is a guarantee. On paper that looks like a generous season. The 36°F light-frost dates are tighter: April 3 in spring and October 31 in fall, according to NWS Little Rock. Tender seedlings need the 36°F dates.
The real limit is not cold but warmth and day length. Most Asian greens respond to rising heat and lengthening days by sending up a flower stalk, which makes the leaves bitter and tough. Spring gives them a few weeks of cool weather before that switch flips. Fall runs the other direction, with shrinking days and falling temperatures that keep the plants leafy. That is why fall is the main season here and spring is the bonus round.
Winter is milder than most northern readers expect. The mean daily minimum of the coldest month at Little Rock is 30.9°F, so most nights hover close to freezing rather than plunging far below it. Hardy types such as mizuna, tatsoi and mustards often get through with a layer of row cover.
| Type | Best season | Heat tolerance | Cold tolerance |
|---|---|---|---|
| Mizuna | Fall, early spring | Low | High |
| Tatsoi | Fall, early spring | Low | High |
| Komatsuna | Fall, spring | Moderate | Moderate to high |
| Mustard greens | Fall, early spring | Low to moderate | High |
| Bok choy / pak choi | Fall | Low | Moderate |
| Napa cabbage | Fall only | Low | Moderate |
| Amaranth | Summer | High | None (frost kills it) |
Exact sowing weeks are laid out in When to Sow Asian Greens in Arkansas.
What will not work here
Spring-sown napa cabbage tops the list. A napa head needs a long stretch of cool weather to fold itself into a tight cylinder, and a March sowing runs into April warmth long before it finishes. The plant bolts or stays loose and leafy. Napa belongs in the fall garden.
Sowing fall crops too early comes next. Late August in a hot, humid climate is still summer. Seedlings in bare, sun-baked soil dry out within hours, and flea beetles riddle young leaves with tiny holes. Start fall sowings when the worst heat is breaking, shade the bed with a piece of cloth until seedlings emerge, and keep the surface damp.
Close spacing fails in this climate. Humid air and spring rain keep the base of a crowded bok choy or napa plant wet, which invites soft rot and mildew. Give full-size heads about a foot of space, and thin baby-leaf rows so air moves through them. Water at the soil, early in the day, and skip overhead watering at dusk.
A weekly deep soak does not work for seedlings. Asian greens have shallow roots, and a dry stretch in August or September can wither a new fall planting between waterings. Small, frequent waterings until the plants are established do better than one big weekly drink. Mulch once seedlings are up to hold moisture.
Tender crops planted by the 32°F dates are another trap. Amaranth is killed by a light frost, so the March 12 to March 28 window is a false signal for it. Wait until after the April 3 light-frost date, and then wait for warm soil on top of that. Any spring transplant set out early should be covered on nights when the forecast drops toward the mid-30s.
Expecting every type to sit through winter uncovered is the last mistake. With a coldest-month mean minimum of 30.9°F, plenty of nights dip below freezing. Mizuna, tatsoi and mustards shrug that off. Full-size bok choy and napa can be damaged by a hard freeze and want row cover or a harvest before the coldest weeks.
What changes across Arkansas
No single answer covers the whole state. The USDA Plant Hardiness Zone Map (2023, based on 1991-2020 normals) places Arkansas across zones 6b to 8a, and other parts of the territory differ. Little Rock is the reference city for the dates above, and gardens in other parts of the state differ from it.
Readers in the north and in the hills of the Ozarks and the Ouachitas should expect fall to arrive earlier and spring to arrive later. Shift fall sowings earlier by several days to a week or two, and treat the Little Rock freeze dates as a rough guide that runs a little late for you. Spring plantings in cold pockets can start later too, because soil takes longer to warm. Elevation changes things quickly: a hilltop and a creek bottom a mile apart can sit on opposite sides of a freeze night.
Readers in the southern and lower-lying parts of the state have a longer fall and a milder winter. Hardy greens carry on through most of the cold months with light protection, and a second fall sowing may still mature. The trade-off is a hotter, wetter late summer, which makes the heat-and-humidity problems in the previous section harder to dodge.
To see where your own garden sits, look up your ZIP code on the USDA Plant Hardiness Zone Map. Zone numbers measure only how cold winter gets at the extreme, so they tell you about overwintering and little about when to sow. Use the zone to judge which types can stand winter outdoors and the local frost record to time the sowing. A broader overview of the crop is in Growing Asian Greens in Arkansas.
Where to check this for your own county
The University of Arkansas Cooperative Extension Service runs an office in every county. That office is the best place to settle county-level questions.
Three things are worth looking for there:
- A vegetable planting calendar written for your part of the state, with fall and spring dates for leafy greens and cole crops.
- Variety recommendations from trials or Master Gardener plots in your county, which show what has held up locally against bolting, mildew and flea beetles.
- Local frost dates, including the 36°F light-frost dates that matter for tender plants.
County agents also know things that no statewide list can, such as which soil types in the area drain slowly, how late the humidity lingers in your river valley, and which pests are active this season. A call or a visit costs nothing, and extension staff tend to field questions about leafy greens every fall.
Take the dates and varieties from this guide as a starting frame, then adjust to what your county office says. If the two disagree, trust the county.
Checking this against your own garden
Your own observations outrank every date above. Three are worth watching, and none needs a gadget.
Soil warmth by feel. Push a hand into the bed to planting depth in the morning. If the soil feels cold and clammy, seeds will sit and may rot. If it feels neutral or slightly warm, they germinate within days. In fall, soil that still feels warm like bathwater means it is too early for the cool-season types, and a bed that stays cool and damp after rain tells you it drains slowly.
The first true leaves. A seedling shows two rounded seed leaves first, then the first pair of true leaves with the shape of the mature plant. If those appear within a week or so of sowing, the timing is good. Seedlings that stretch, yellow or stall at that stage are telling you the bed is too hot, too dry or too shaded.
Where frost shows up first. Look at the lawn at dawn on the first cold mornings. Frost that whitens the low corner of the yard while the area against a south-facing wall stays green marks your coldest and warmest spots. Put hardy greens in the cold corner and tender or late plantings near the wall.
One more signal helps in spring: a thickening, rising center stalk on a bok choy or mizuna plant means it is bolting. When you see it, harvest the whole plant and replant the bed for the next season.
Common questions
Can you grow Asian greens through an Arkansas summer?
Most types bolt in summer heat, so the leafy cool-season greens are better saved for fall and early spring. Amaranth handles heat well and gives a steady harvest of tender leaves once soil is warm.
Which Asian green is easiest to start with?
Mizuna and tatsoi are forgiving. They sprout quickly, tolerate light frost, and give usable baby leaves. Mustard greens are another easy pick if you like a peppery bite.
Will Asian greens survive an Arkansas winter?
Hardy types often do, particularly with row cover. The coldest-month mean minimum at Little Rock is 30.9°F, so many nights are only slightly below freezing. Full-size bok choy and napa are less reliable through hard freezes.
When should fall sowing start?
Count back from the first fall frost, which at the Little Rock reference station falls between November 7 and November 20 (32°F). Fast greens can go in as heat breaks in September, and heading types such as napa need to start earlier. Local calendars from your county extension office will refine this.